Carrier RTU OPEN 11-808-427-01 - Manual (Page 33)

RTU Open 27
Wiring specifications
Cable from sensor to controller: If <100 ft (30.5 meters) 22 AWG, unshielded
If >100 ft (30.5 meters) 22 AWG, shielded
Maximum length: 500 feet (152 meters)
To wire the OAQ sensor to the controller
1 Wire the sensor to the controller. See appropriate diagram below.
2
Install a field-supplied dedicated 24 Vac transformer or DC power supply.
3 Apply power and verify sensor readings.
Wiring diagram for #33ZCSENCO2:
NOTE
Sensor may be terminated at Input 1 or 2.
Wiring a Relative Humidity sensor
Wall sensor - Part #33ZCSENSRH-02
Duct sensor - Part #OPNSENRH-02
The Relative Humidity (RH) sensor may be used for zone humidity control (dehumidification) when applied to
a Carrier rooftop unit equipped with the Humidi-MiZer™ option. On units not equipped for dehumidification,
the sensor monitors humidity, but provides no control.
NOTE
You cannot use a relative humidity sensor when using both a CO2 and OAQ sensor on the controller.